Relpol RM40 Series PCB Relays. Relpol RM40 series miniature relays for general purpose applications. The RM40 relays are designed for PCB mounting and are suitable for a wide range of applications such as automobile, machine and electronic equipment. Features and Benefits. DC coils. High load up to 5 A (CO) or 8 A (NO). Compact size. High shock and vibration resistance